//IE对indexOf方法的支持
if(!Array.prototype.indexOf){
    Array.prototype.indexOf = function(obj){              
        for(var i=0; i<this.length; i++) if(this[i]===obj) return i;
        return -1;
    };
}

var _api,//对外API
_keyMap = {//特殊键
    backspace: 8, tab: 9, clear: 12,
    enter: 13, 'return': 13,
    esc: 27, escape: 27, space: 32,
    left: 37, up: 38, right: 39, down: 40,
    del: 46, 'delete': 46,
    home: 36, end: 35,
    pageup: 33, pagedown: 34,
    ',': 188, '.': 190, '/': 191,
    '`': 192, '-': 189, '=': 187,
    ';': 186, '\'': 222,
    '[': 219, ']': 221, '\\': 220
},
_scope = 'all',//默认热键范围
_modifier = {//修饰键
    '⇧': 16, shift: 16,
    '⌥': 18, alt: 18, option: 18,
    '⌃': 17, ctrl: 17, control: 17,
    '⌘': 91, command: 91
},
_downKeys=[],//记录摁下的绑定键
modifierMap = {
    16:'shiftKey',
    18:'altKey',
    17:'ctrlKey',
    91:'metaKey'
},
_mods = { 16: false, 18: false, 17: false, 91: false },
//返回键码
code = function(x){ 
    console.log();
  return _keyMap[x] || x.toUpperCase().charCodeAt(0);
},
_handlers={};
// F1~F12 特殊键
for(k=1;k<20;k++) {
    _keyMap['f'+k] = 111+k;
}

//设置获取当前范围（默认为'所有'）
function setScope(scope){ _scope = scope || 'all';}
function getScope(){ return _scope || 'all';}
//绑定事件
function addEvent(object, event, method) {
    if (object.addEventListener){
        object.addEventListener(event, method, false);
    }else if(object.attachEvent){
        object.attachEvent('on'+event, function(){ method(window.event); });
    }
}
//判断摁下的键是否为某个键，返回true或者false
function isPressed(keyCode) {
    if(typeof(keyCode) === 'string'){
        keyCode = code(keyCode);//转换成键码
    }
    return _downKeys.indexOf(keyCode) !==-1;
}
//获取摁下绑定键的键值
function getPressedKeyCodes (argument) { return _downKeys.slice(0);}
//处理keydown事件
function dispatch (event) {
    var key = event.keyCode,scope,asterisk = _handlers['*'];

    //搜集绑定的键
    if(_downKeys.indexOf(key)===-1) _downKeys.push(key);
    //Gecko(Friefox)的command键值224，在Webkit(Chrome)中保持一致
    //Webkit左右command键值不一样
    if(key === 93 || key === 224) key = 91;
    if(key in _mods) {
        _mods[key] = true;
        // 将特殊字符的key注册到 hotkeys 上
        for(var k in _modifier)if(_modifier[k] === key) hotkeys[k] = true; 
        if(!asterisk) return;
    }
    //将modifierMap里面的修饰键绑定到event中
    for(var e in _mods) _mods[e] = event[modifierMap[e]];

    //表单控件控件过滤 默认表单控件不触发快捷键
    if(!hotkeys.filter.call(this,event)) return;
    //获取范围 默认为all
    scope = getScope();

    //对任何按键做处理
    if(asterisk) for (i = 0; i < asterisk.length; i++) {
        if(asterisk[i].scope === scope) eventHandler(event,asterisk[i],scope);
    }

    // key 不在_handlers中返回
    if (!(key in _handlers)) return;

    for (i = 0; i < _handlers[key].length; i++) {
        //找到处理内容
        eventHandler(event,_handlers[key][i],scope);
    }
}

function eventHandler(event,handler,scope){
    var modifiersMatch;
    //看它是否在当前范围
    if(handler.scope === scope || handler.scope === 'all'){
        //检查是否匹配修饰符（如果有返回true）
        modifiersMatch = handler.mods.length > 0;
        for(var y in _mods){
            if((!_mods[y] && handler.mods.indexOf(+y) > -1) ||
                (_mods[y] && handler.mods.indexOf(+y) === -1)) modifiersMatch = false;
        }
        // 调用处理程序，如果是修饰键不做处理
        if((handler.mods.length === 0 && !_mods[16] && !_mods[18] && !_mods[17] && !_mods[91]) || modifiersMatch || handler.shortcut === '*'){
            if(handler.method(event, handler)===false){
                if(event.preventDefault) event.preventDefault();
                else event.returnValue = false;
                if(event.stopPropagation) event.stopPropagation();
                if(event.cancelBubble) event.cancelBubble = true;
            }
        }
    }
}

//解除绑定某个范围的快捷键
function unbind (key,scope) {
    var multipleKeys = getKeys(key),keys,mods = [],obj;
    for (var i = 0; i < multipleKeys.length; i++) {
        
        //将组合快捷键拆分为数组
        keys =multipleKeys[i].split('+');
        
        //记录每个组合键中的修饰键的键码 返回数组
        if(keys.length > 1) mods=getMods(keys);
        
        //获取除修饰键外的键值key
        key = keys[keys.length - 1];
        key = code(key);

        //判断是否传入范围，没有就获取范围
        if(scope === undefined) scope = getScope();

        //如何key不在 _handlers 中返回不做处理
        if (!_handlers[key]) return;

        //清空 handlers 中数据，
        //让触发快捷键键之后没有事件执行到达解除快捷键绑定的目的
        for (var r = 0; r < _handlers[key].length; r++) {
            obj = _handlers[key][r];
            //判断是否在范围内并且键值相同
            if (obj.scope === scope && compareArray(obj.mods, mods)) {
              _handlers[key][r] = {};
            }
        }
    }
}
//循环删除handlers中的所有 scope(范围)
function deleteScope(scope){
    var key, handlers, i;
    for (key in _handlers) {
        handlers = _handlers[key];
        for (i = 0; i < handlers.length; ) {
            if (handlers[i].scope === scope) handlers.splice(i, 1);
            else i++;
        }
    }
}
//比较修饰键的数组
function compareArray(a1, a2) {
    if (a1.length !== a2.length) return false;
    for (var i = 0; i < a1.length; i++) {
        if (a1[i] !== a2[i]) return false;
    }
    return true;
}
//表单控件控件判断 返回 Boolean
function filter(event){
    var tagName = (event.target || event.srcElement).tagName;
    //忽略这些标签情况下快捷键无效
    return !(tagName === 'INPUT' || tagName === 'SELECT' || tagName === 'TEXTAREA');
}
//修饰键转换成对应的键码
function getMods (key) {
    var mods = key.slice(0, key.length - 1);
    for (var i = 0; i < mods.length; i++) mods[i] = _modifier[mods[i]];
    return mods;
}
//处理传的key字符串转换成数组
function getKeys(key) {
    var keys;
    key = key.replace(/\s/g, '');//匹配任何空白字符,包括空格、制表符、换页符等等
    keys = key.split(',');
    if ((keys[keys.length - 1]) === '') keys[keys.length - 2] += ',';
    return keys;
}

//在全局document上设置快捷键
addEvent(document, 'keydown', function(event) {
    dispatch(event);
});
addEvent(document, 'keyup',function(event){
    clearModifier(event);
});
//清除修饰键
function clearModifier(event){
    var key = event.keyCode,
        i = _downKeys.indexOf(key);

    if(i>=0) _downKeys.splice(i,1);

    //修饰键 shiftKey altKey ctrlKey (command||metaKey) 清除
    if(key === 93 || key === 224) key = 91;
    if(key in _mods) {
        _mods[key] = false;
        for(var k in _modifier) if(_modifier[k] === key) hotkeys[k] = false;
    }
}
//主体hotkeys函数
function hotkeys(key,scope,method){
    var keys = getKeys(key), mods=[],i=0;
    //对为设定范围的判断
    if (method === undefined) {
        method = scope;
        scope = 'all';
    }
    //对于每个快捷键处理
    for(;i < keys.length; i++){
        key = keys[i].split('+');
        mods = [];
        //如果是组合快捷键取得组合快捷键
        if (key.length > 1){
            mods = getMods(key);
            key = [key[key.length-1]];
        }
        //转换成键码
        key = key[0];
        key = key === '*' ? '*' : code(key);
        //判断key是否在_handlers中，不在就赋一个空数组
        if (!(key in _handlers)) _handlers[key] = [];
        _handlers[key].push({shortcut: keys[i], scope: scope, method: method, key: keys[i], mods: mods});
    }
}
_api = {
    setScope:setScope,
    getScope:getScope,
    deleteScope:deleteScope,
    getPressedKeyCodes:getPressedKeyCodes,
    isPressed:isPressed,
    filter:filter,
    unbind:unbind
};
for (var a in _api) hotkeys[a] = _api[a];

var _hotkeys = window.hotkeys
hotkeys.noConflict = function( deep ) {
    if ( deep && window.hotkeys === hotkeys ) {
        window.hotkeys = _hotkeys;
    }
    return hotkeys;
};
window.hotkeys = hotkeys;

